Electrical heating unit.



F. -KUHN & F. E. SHAILOR. ELECTRICAL HEATING UNIT.

APPLICATION FILED OCT. l6.1909.

' Patented Sept. 21, 1915.

metal plates UNITED smras 4 PATENT 0FFICE.

FRANK KUHN AND FRANK E. SHAILOB, OF DETRUIT, MICHIGAN, ASSIGNOES TOAMERICAN ELECTRICAL HEATER COMPANY, OF DETROIT, MICHIGAN, A COR.-

PORATION OF MICHIGAN.

ELECTRICAL HEATING UNIT.

Specification of Letters Patent.

Patented Sept. 21, 1915.

Application filed October 16, 1909. Serial No. 523,016.

To all whom it may concern:

Be it known that we, FRANK KUHN and FRANK E. SHAILOR, citizens of theUnited .JStates of America, residing at Detroit, in the county of Wayneand State of Michigan, have invented certain new and usefulImprovementsin Electrical Heating Units, of which. the following is aspecification, reference being had therein to the accompanying drawings.I

The invention relatesto electrical heating units designed for use invarious constructions of electrical heaters, and it is the ohtheinvention to obtain a thoroughly ance, and one in which the-heat isdissipated through conduction from all portions of the resistance. r

To this end, the invention. consists In the construction as hereinafterset forth.

tive view of one form of unit; Fig. 2 is a perspective view with aportion of the armor and an insulating plate broken away, of a slightlymodified construction, the resistance element being diagrammaticallyshown Fig. 3 is a conventional section On line w-w,

plates in firm contact with the mica and resistance throughout theirextent, a plurality of intermediate stays F are employed and these asshown, are in the form of hollow rivets which pass through theinsulating plates and armor plates but avoid the resistance. I

G are terminals which in the construction shown in Fig. 1, aremechanically secured to H attached to the ends of the plates C and D byrivets J. The ends I of the resistance are clamped between the flange Kon the terminal, and a washer L,

the several parts of the terminal being suitably insulated from' theplate H.

In Fig. 2 the support for the terminal is formed by an integralextension of the plates and D but the resistance is con: nected to theterminal in the same manner as described in connection with Fig.1.

In use the construction of the unit de- SCIIIbGU. will-be thoroughlyprotected from 1n ury and from short circuit, and at the same time theheat is dispersed with almost as great facility as from the baseresistance.

What We claim as our invention is:

1.7 A flat heating unit, comprising a flat resistance element, fiatinsulation upon opposite sides of the resistance, a flat armor inclosingthe resistance and insulation and firmly clamping the insulationand'resistance therebetween, and plug engaging ter- In thedra-vvings-F1gure lwis a perspec 2. A flat heating unit, comprising afiat resistance element, flat insulation upon opposite sides of theresistance, a fiat armor inclosing the resistance and the insulation andfirmly clamping the resistance and insulation therebetween, said armorhaving a projection, and plug engaging terminals rigidly carried by saidprojection and insulated therefrom, said resistance, armor and terminalsforming a unitary structure.

'3'. A flat heating unit, comprising a flat resistance element, flatinsulator plates upon opposite sides of said resistance, armor platesparallel to the insulator plates positioned upon opposite sides of thelatter and united to each other at the margins thereof, a plurality ofspacer; hollow rivets passing through said insulator plates and armorplates to prevent bucklin thereof, and plug engaging terminals carriedby said armor plates and forming a unitary part of the I nnited to eachother at the margins thereof, n

' In testimony whereof We afiix our signatures 1n presence of twowltnesses.

FRANK KUHN. FRANK'E. SHAILOR.

Witnesses:

LEO PORDEN, HENRY F. KoLBE.

